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SFPM = (wheel diameter x 3.1416 x RPM)/12

So a 3" wheel @ 3450 RPM = 2709.62 SFPM

And a 4" wheel @ 1700 RPM = 1780.23 SFPM


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It's not a cheap option, but this is what I use: Foredom M.BL Bench Lathe. It has variable speed, and for polishing two screws and wingnuts are more than sufficient to hold it to the bench - so...